What is the most common bacterial cause of traveler's diarrhea?

The most common bacterial cause of traveler's diarrhea is Escherichia coli, particularly the enterotoxigenic strain (ETEC). This specific strain is prevalent in areas where sanitation and water quality may be compromised, leading to its association with contaminated food and water during travel. Upon ingestion, E. coli releases toxins that cause gastrointestinal symptoms, including diarrhea. Given its predominance and the frequent reports of traveler’s diarrhea linked to its presence, it is essential for those traveling to know about this pathogen and take preventive measures, such as practicing good hygiene and being cautious about water and food sources.

The other bacterial options, while they can cause diarrhea, tend to be less common causes of traveler's diarrhea compared to E. coli. Campylobacter jejuni, Salmonella, and Shigella are all significant enteric pathogens but are more commonly linked to specific outbreaks and are less frequently the sole cause of the traveler's diarrhea experience.